[usergone]

I suppose I should "clarify the idea" in the last post. What I am trying to accomplish in the above post is...

The current supplied to the injector is converted to a voltage, by means of a shunt. The voltage difference across the shunt will be called voltage A.

If voltage A is less than X, but greater than Y, a 0 to 12V signal is supplied to the guino.

X would be to cut off the top current from the "peak," and the Y is to set a threshold for what constitutes the "hold" part of the injection cycle.